Plot histogram of total number of umis per cell in the umis matrix
mcell_plot_umis_per_cell(mat_id, min_umis_cutoff = NA, bin_for_cutoff = 50)
id of the mat to use
If not null, will mark this cutoff by a line. If NA, auto calculate by finding the first bin in the histogram with more cells then its predecessor.
bin size for histogram used to auto find min_umis_cutoff
min_umis_cutoff (either the given, the calculated, or null)